Switchable terahertz dual-function device based on vanadium dioxide metasurface

Abstract

The invention relates to the field of electromagnetic metasurfaces, in particular to a vanadium dioxide metasurface-based switchable terahertz dual-function device. The switchable metasurface is formed by compositing a vanadium dioxide pattern layer, a polycrystalline silicon dielectric layer, a gold pattern layer, a vanadium dioxide thin film layer, a polyimide dielectric layer and a gold reflecting layer, wherein the vanadium dioxide pattern layer, the polycrystalline silicon dielectric layer, the gold pattern layer, the vanadium dioxide thin film layer, the polyimide dielectric layer and the gold reflecting layer are arranged in sequence from top to bottom in a diagonal mode, and the gold pattern layer is composed of a gold split ring resonator and an L-shaped gold bar. A broadband absorption function can be realized by the switchable metasurface; when vanadium dioxide is in an insulated state, the metasurface can be switched to realize a reflective linear polarization conversion function. By utilizing the phase change characteristic of the vanadium dioxide material, the characteristics of two dual-function devices, namely the broadband absorber and the reflective linear polarization converter, are integrated into one metasurface structure, so that the problem of single function in the traditional metasurface structure is solved, and the application of the metasurface structure is more flexible and universal.

Description

technical field [0001] The invention relates to the field of electromagnetic metasurfaces, in particular to a switchable terahertz dual-function device based on vanadium dioxide metasurfaces, which can realize broadband absorption and reflection linear polarization conversion functions. Background technique [0002] Terahertz wave manipulation technology has received increasing attention due to its wide-ranging applications in wireless communications, biomedical imaging, and radar stealth. However, the key issue affecting the practical application of terahertz is the lack of functional devices with excellent performance. This is mainly due to the lack of materials that can directly interact with terahertz waves in nature. To address this problem, metamaterials are considered as ideal platforms for terahertz functional devices. Metamaterials are artificially designed electromagnetic composites that have a wide range of applications in metalens, perfect absorbers, and polari...

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Problems solved by technology

[0006] In order to overcome the problem of single function at the working frequency, the present invention proposes a broadband absorber and reflective linear polarization converter based on vanadium dioxide switchable metasurface

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